Heating furnace or stove



April ze, 1927. 1,626,054

G. STRIFFLER HEATING FURNACE OR STOVE Filed June 5o. 1926 2 Sheets-sheet 1 O O G @gio G O O i f; /20 i; 1 i ZZ-wf JW/M.

April 26 1927. 1,626,054

G. sTRlFFLE- V HEATING FURNACE OR STOVE Filed June 30, 1926 2 Sheets-Sheet 2 Patented Apr. 2&3, 1937.

GOTTLIEB STRIFFLER, OF CHICAGO, ILLINOIS.

HEATING FURNACE @It STOVE.

Application filed .Tune 30, 192,6. Serial No. 119,603.

The invention relates to furnaces or stoves used for the purpose of heating dwellings, residences, store rooms and so forth. More especially it relates to stoves or furnaces of 5 that type utilized for the purpose not only to heat the room wherein the stove is located, but to heat other rooms, into which airheated by said stove is conducted by means of pipes or ducts communicating with said l stove.

rlhe object of the invention is to provide a` ystove occupying a comparatively small space only, but adapted to heat not only the room in which the stove is located., hut `also l other rooms into which air heated by the stove is conducted bymeans of pipes or the like communicating with the stove.

A further object of the invention is to provide a stove having a main duct for the 3" gases of combustion and a plurality of smaller ducts for said gases, said smaller ducts communicating with the main duct and adapted to conduct the gases of combustion in a direction opposite to that direction in which the said gases flow through the main duct. e

Another object of the invention is to provide a stove having a plurality of air duets adapted to conduct the air i-n such a manner as to heat said air by the gases of 'combustion while the air to be heated flows continuously in one direction and the gases of combustion flow first in one and `th-en in the opposite direction.

Another object-of lthe invention is to provide a stove wherein adjacent airducts and gasducts have a common wall, said lcon'unon wall being formed by a continuous piece of metal. y

@ther objects of the invention not specifically mentioned will be easily ascertained and understood from the following description.

The invention resides in the construction of different parts of -the stove, the assembly of said different parts and in the different comhinations `of said parts as set' forth in the description, shownand illustrated in the drawings, and more specifically pointed out '10 in the claims yappended hereto.

In'the drawings:

Fig. 1 is a fro-nt eleva-tion ofthestove.

Fig. 2 is a section taken substantially kon line 2--2 on Fig. 1.

Fig. 3 is a section taken on line on Fig. 1.

.rests on top of the base and surrounds the -t-endsoutw-ardly and upwardly, the-two por- F ig. i is section taken on line 4 4 on Fig. 1

Fig. 5 is an enlarged view of the connection indicatedby A `on Fig. 2.

Fig. 6 is a section on line 6-6 of Fig. 2.

The stove has a base 6 with a bottom plate 7 having a central opening 8. The side wall of said base has a portion 9 extending upwardly and inwardly of the rim of the bottom plate 7. From this portion 9 another portion 10 extends vertically upward. On the inner side of the wall of the base a plurality of brackets 11 areprovided. A pan 12 restson said brackets. Carrier bars 13 rest- 70 ing inside the pan support a plate 14. This plate forms the bottom closure of the inner part of the stove and supports the inner lower shell 15. This shell 15 is provided with corrugations as shown in F ig. 1, and 75 the circumference of the plate 14 corresponds with the shape of the cross section of the shell 15. A ring 16 isconnected to the upper surface of plate 14, and a fire pot 17 restson said ring. A movable grate 18 90 rests inside of the lire pot on the ringlt. An actuating har 19 is fastened to the grate and extends through the ring and the lower inside shell 15. An outer lower lshell 2O inner lower shell 1'5, asshown in Fig. 4. A chute 21 extends from the inner lower shell 15 through the outer lower shell., and a hinged door 22 is adapted to .close theouter end of said chute,the inner end whereof 90 communicates with the interior of the inner lower shell. The chute is arranged and located in such a mannenthat coal or other fuel introduced into said chute will drop into the fire pot 17. Above the chute 21 is 95 a pipe 23 or the like communicating with the' interior of the shell 15 and extending through the outer shell. A hinged door 24 is adaptedto partially or entirely close said pipe.

An outer middle shell 25 rests on top of the lower outer shell. The lower portion of this outer middle shellextends inwardly and upwardly, andthe upper portion thereof eX- tions Vbeing connected by a curved portion. Thezuppe'r end of the outer middle shell has a smaller diameter than the lower end.- An outer upper shell 26 is supportedby-the upperend of the outer middle shell land is of ythe Same diameter as said upper end.

An .inner middle shell 27 ,rests on the upper end of the inner lower shell l5, and the lower end of said inner middle shell has a circumference corresponding to the circumference of the inner lower shell, as shown in Fig. ll. The wall of the lower portion of the inner middle shell extends upwardly and inwardly, and the outer surface of said portion becomes gradually smooth, i. e. the corrugations which are provided on said lower end to correspond with the corrugations on the inner lower shell l5 gradually disappear. The lower portion of the inner middle shell connects with a smooth outwardly curving middle portion. The upper portion of said inner middle shell extends outwardly and upwardly and gradually becomes corrugated again, until the outer circumference corresponds with the shape of an upper inner shell 28 best shown in Fig. 8. This upper shell is supported by the upper end of the inner middle shell. The outer corrugations of the lower inner shell l5 lie snugly against the inner surface of the outer shell 20, as shown in Fig. el. The two middle shells form a passage one with the other, said passage getting narrower from the lower ends of said shells toward the curved portions thereof.

The outer corrugations of the upper inner shell 28 lie snugly against the inner face of the outer shell 26.

A carrier ring 29 is fastened to the smooth inner side of the inner middle shell 27 right on the lower end of the curved portion thereof. A pipe like duct 30 is supported by said carrier ring and extends upwardly. The smooth inner surface of the curved portion of the inner middle shell abuts the outside surface of said duct, and the inner corrugations of the upper inner shell 28 abut also said outer surface. The duct 30 and the upper inner shell extend upwardly to approximately the same height, while the outer upper shell 26 extends some distance above the two other parts.

The upper end of the upper inner shell 28 is closed by a cover 3l. This cover is, as shown in Figure 2, concaved so that the upper end of the pipe 30 will not be closed by said cover. The circumferential shape of the cover 31 is such that it corresponds with the outer shape of the inner shell 28, as shown in Figure 6. Then this cover is in place the ducts e2 formed by the outer surface of the inner shell 28 and the outer shell 26 are not closed by said covenso that the air may rise through said ducts. Thi.` cover rests on the upper end of the inner shell 28, so that the gases of combustion rising through the pipe 30 will be deflected by the cover' 3l and will be forced downward through the ducts 38.

As stated above, the outer upper shell extends above the duct 30 and the inner upper shell '28, Above said two parts the outer up- Leanne/i.-

per shell narrows down to a neck 32, communicating with an air distributing duct which may have branch ducts connected therewith.

An opening 35 is provided in the lowerl outer shell 20 adjacent the base 6. A door 36 is adapted to close said opening 35.

The operation of the stove is as follows:

Fuel is introduced into the fire pot l? through the chute 2l. The door 36 is opened, and water is poured into the pan l2. The heat created by the burning of the fuel in the fire pot creates a draft, and cold air will enter through the hole 8 in the bottom plate 7. This air will travel upwardly in the ducts 37 formed by the inner lower shell l5 and the outer lower shell 20. rThe of combustion will travel upwardly inside of the inner lower' shell and the pipe shaped duct 30. Then the said gases will be forced downwardly by the cover 3l and will travel through the ducts formed hy the pipe 30 and the upper inner shell 28. A iiue pipe 39 communicating with the upper portion of the inner middle shell 27 is adapted to conduct the gases of combustion to a chimney or the like. The current of air rising in the ducts 37 comes into intimate contact with the heated shell l5. This current of air must pass through the comparatively narrow space or channel formed by the outer and inner middle shells, so that the air current passing through said space is comparatively shallow and can easily be heated. In order to still further increase the heating effect of the stove a carrier bar 40 is fastened inside of the pipe 30. This bar carries a downwardly extending rod il on which a baflie plate 43 is mounted. Said baffle plate forces the gases of combustion into intimate contact with the inner middle shell forming the inner wall of the narrow channel through which the air current flows. This channel communicates at its upper end with the air 'duct 42 formed by the upper outer and upper inner shells, so that here again the air will be heated by the gases of combustion flowing downwardly in the ducts 38 as described hereinbefore.

The water in the pan l2 will be slowly evaporated and will thereby moisten the air to be heated.

The air ducts L,1 2 communicate at. their upper ends with the neck 32 and therethrough with the distribution duct 33.

Should the stove gettoo hot, cold air can be introduced into the gases of combustion for cooling purposes by opening the door 24.

The stove should be located over a hole provided in the flooring whereon the stove rests, said hole connecting with the atmosphere and registering with the opening 8 in the base of the stove.

If preferred the stove may be provided with legs (not shown) whereby the base of the stove would be raised from the flooring so that the central opening 8 would communicate with the atmosphere.

That I claim as new and desire to secure oy Letters Patent is:

l. A stove of the class described having an outer shell and an inner shell, the inner shell forming a duct for the gases of combustion and being provided with eorrngations extending lengthwise thereof substantially over the entire length thereof but leaving a smooth middle portion, said middle portion having a reduced diameter, the outer shell forming with the outer corrugations of the inner shell a plurality of ducts for air to he heated and with the smooth middle portion of the inner shell a narrow passage way for said air connecting the upper and lower portions of said plurality of air ducts, and a pipe fitting snugly into the smooth middle portion of the inner shell, forming a continuation of the lower portion thereof, and formingwith the inner corrugations of the upper portion of the inner shell a plurality of ducts for the gases of combustion, said ducts communicating with the upper end of said pipe.

2. A stove of the class described having an outer shell and an inner shell, the inner shell forming a duct for the gases of combustion and being provided with corrugations extending lengthwise thereof and substantially over the entire length thereof, said inner shell having a smooth middle portion of reduced diameter, the outer shell forming with the outer corrugations of the inner shell a plurality of ducts for air to he heated and forming with the smooth middle portion of the inner shell a narrow passage way for said air to he heated, said passage connecting the upper and lower portions of the plurality of air ducts, a pipe fitting snugly into the smooth middle portion of the inner shell, forming a continuation of the lower portion thereof, and forming with the inner cor rugations of the upper portion of the inner shell a plurality 'of ducts for the gases of combustion, said ducts communicating with the upper end of said pipe, and means located in the inner shell for forcing the gases of combustion flowing through said shell into intimate contact with the middle portion of the inner shell forming the inner wall of the narrow passage way for the air to he heated.

In witness whereof I have affixed hereunto my signature.

GOTTLIEB STRIFFLER. 

